a ray cuts a line forming two angles. the difference between the two angles is 18°.

What does each angle measure?
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When a line is cut by another line, two angles are formed that are complementary, that is, they add up to 180 degrees. If one angle is x the other is x+18, so x+x+18=180. So 2x=180-18=162. Therefore x=81 and the other angle is 81+18=99. 99+81=180.

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